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Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)

Washington : Government printing office · leaf 217

An illustration from Annals of the Astrophysical Observatory of the Smithsonian Institution, 1900, leaf 217 — VOL. 6, PL. 7 ANNALS OF THE ASTROPHYSICAL OBSERVATORY … MOUNT WILSON SPECTROHELIOGRAMS, 1930

Infrared spectra · Solar radiation

Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.

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